21122133213221 has 8 divisors (see below), whose sum is σ = 21572838169344. Its totient is φ = 20671482334960.

The previous prime is 21122133213163. The next prime is 21122133213277. The reversal of 21122133213221 is 12231233122112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122133213221 - 2⁶ = 21122133213157 is a prime.

It is a super-2 number, since 2×21122133213221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122133213281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12729470 + ... + 14292783.

It is an arithmetic number, because the mean of its divisors is an integer number (2696604771168).

Almost surely, 2^{21122133213221} is an apocalyptic number.

It is an amenable number.

21122133213221 is a deficient number, since it is larger than the sum of its proper divisors (450704956123).

21122133213221 is a wasteful number, since it uses less digits than its factorization.

21122133213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27038931.

The product of its digits is 1728, while the sum is 26.

Adding to 21122133213221 its reverse (12231233122112), we get a palindrome (33353366335333).

The spelling of 21122133213221 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred thirty-three million, two hundred thirteen thousand, two hundred twenty-one".